Cell type filter element



@ma z 3194@ v D. Umm' y ZAWZZ y CELL TYPE FILTER ELEMENT Filed June 27,1947 Patented Dec. 28, 1948 erica CELL TYPE FILTER ELEMENT George D.Burley, Cleveland, Ohio, assignor, by mesne assignments, to FramCorporation, East Providence, R. I., a corporation of Rhode IslandApplication June 27, 1947, serial No. 757,630 claims. (ci. 21o-169) Thisinvention relates to a cell type lter element for collecting contaminantfrom liquids to be filtered therethrough.

In the use of a cell type filter element such as that made from someporous stock, such as paper, different shapes of members stacked oneupon the other have been provided. In many instances, the shapes becomecomplicated an'd thus the cost of cutting out tools for producing thesame is expensive. Also, in the more complicated types of sheet members,the structure may be weak in parts and thus apt to rupture. Also somewarping l,of the plates at the ends of a stack of sheet members is aptto occur due to expansion of the members if the stack is supported nearits outer periphery.

One of the objects of this invention is to provide a shape of sheetmember which may be used in one form throughout the stack, thus makingunnecessary the formation of two shapes for the use in the element.

Another object of this invention is to simplify the shape of each of thefiltering members of.

identical conguration to reduce cost of dies or the cutting out toolsfor the members.

Another object of the invention is to provide a more rugged shape ofsheet member for serving in the stack of members.

Another object of the invention is to provide an arrangement of membersin the stack with a support therefor so that the possibility of warpingthe end plates of the stack is reduced to a minimum.

With these and other objects in view, the invention consists of certainnovel features of construction as will be more fully described andparticularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is a sectional view of a filter, showing the clement in positionin the case;

Fig. 2 is a perspective view of one o; the sheet members of the element;

Fig. 3 is a top plan view of two or more oi the sheet members piled oneon top of the other.

In proceeding with this invention, I form in any suitable manner, suchas by cutting out from a sheet stock filter medium which may be paper orcardboard, a member of the shape shown in Fig. 2 and by oppositelypositioning these members in piling them one upon the other so thatopenings through the members will register, I provide a stack. The areaabout the opening is of rugged structure and provides the location wherepressure may be exerted by expansion of the members and at' thislocation I support the end plates by means of rods which serve to locateas well as to tie together the stack of members at a Well supportedlocation.

With reference to the drawings, i@ designates a metal case usually ofcylindrical construction. although not necessarily so, which has acenter tube i l secured to the bushing l2 whose flange i3 is welded tothe outer bottom oi the casing.l This bushing is threaded as at ld 4forconnection to a conduit for leading the filtrate from the casing. Adrain plug l5 closes' an opening i@ through a boss il also in the bottomportion of the lter. An inlet opening is designated i8 and is threadedfor connection to a conduit to supply contaminated liquid to the casing.The cover l@ is sealed upon the upper edge of the casing by gasket 2tand is held in position by headed screw 2l having threads at 22 toengage the innerI surface of the upper end of the center tube il.

The lter element aboutwhich this invention centers is designatedgenerally 25 and consists of a plurality of sheet members 26 shown inperspective in Fig. 2. In this particular case, the outer periphery ofthe member 26 is circular so that the element 25 is generallycylindrical, although other shapes may be provided. The sheet member 26is formed of any suitable filter medium such as paper, chipboard,cardboard, or of a felted mass, of a weight which will be sufficient tobe selfsupporting so that the member may extend generally horizontallywithout drooping or bending so as to maintain a space between it andlike members spaced from it. The paper, chipboard or other lter lmediumof this member will transmit nitrate through it in the plane parallel toits surface. The outer edge of this member 26 designated 21 is the shapeof a half circle and covers an arc of substantially degrees from thecenter of opening 28 so that the portion which extends from the opening28 forms a web portion 29 as shown in Fig. 2. There is also provided inaddition to the half circular area a radiating portion 30 whichsurrounds the opening 28 with sumcient stock so as to provide a goodrigid part of the member 26 which will not easily break out between theopening 28 and the edge of this portion 30. The opening 28 isillustrated as rectangular and serves by reason of this shape for theinitial alignment of the members when in stacked relation. Thedistance'between the corner 3i and the periphery 32 of this portion 30is the shortest distance from the periphery to the opening and thusserves as the point of initial filtering through the paper stock of themember.

The members 28 are stacked alternately in op- 3 posite relation withreference to the long axis of the rectangular opening 2l so that therectangular openings in adjacent and contacting members will be inalignment and by reason of this stacking there is providedl cells 35between the web portions 29 of the members on either side oi thediametrical line through the long axis of the rectangular opening 28. Inorder that the stack may be maintained in alignment and also held inassembled relation, openings $8 are provided in each of the members 28on one side of the opening' 28 and notches 31 are provided in theportion 30 on the other side of the diametrical longitudinal axis of theopening 2l for the reception of tie rods. y

A bottom plate 38 is provided for one end of the stack and a top plateI9 provided for the other end of the stack, which plates are flanged asat 40 to extend overV the peripheral edges oi' the stack. Rods ll extendthrough the aligned openings 3S and notches 31 and are tied at theirends by means of heads 42 and members 43 so as to maintain the stack ofmembers in substantially the position in which they are located whilealso preventing the members from expanding due to liquid absorbed. Areinforcing end plate 50 at each end may be used. This manner of placingthe rods 'Il closely adjacent the center of opening '28 and through thelarge supporting area and the overlapping parts of the members 28 servesto very nicely and eilectively support the stack and hold itagainstrwarping.

The stack with its end plates is assembled over the 4center tube Il andrests upon an abutment 45 at the lower end and is pressed downwardlyonto this abutment by a spring I6 acting between the cover and the otherend of the element. Liquid which surrounds the element will pass inthrough the cells between the portion 29 of the members 26 passingthrough the members 28 and to the center opening 28 and thence outanimas through opening Il in the center tube downward. 1y from thecenter tube and out of the nlter. This opening 41 also maintains thelevel of oil in the casing when the circulation to the casing stops.

.The die is very simple for cutting out the sheet members which form thestructure.

I claim:

1. A cell type illter element comprising a stack of sheet members ofidentical conilguration, each member having an opening for registeringwith a like opening in the next member, and each member having a webportion radiating from said -opening throughout substantially of arcfrom the center of said opening to the periphery oi said element andradiating a lesser amount oppositely to enclose said opening, adjacentmembers being oppositely disposed to form cells between like positionedmembers on opposite sides of a diametrical line through the center axisof the element and with the portions surrounding the openingsoverlapping to provide the cell spacing.

2. A cell type lter element as in claim 1 wherein said members are eachself-supporting.

3. A cell type iilter element as in claim l wherein said openings areout o! round in shape to provide a means for aligning said members.

4. A cell type filter element as in claim 1 wherein rods extend throughsaid stack of members between the periphery of the element and thecenter of said opening and through a portion of each of said members.

5. A cell type lter element as in claim 1 wherein rods extend throughsaid stack of members betweenthe periphery of the element and the centerof said opening and through a portion of each of said members where theyoverlap.

GEORGE D; BURLEY..

No references cited.

